Exercise 1

Exercise 2

Exercise 3

Exercise 4

References

Application written in R (R Core Team 2015) using data from the COVID-19 Dashboard by Johns Hopkins University (JHU)(Dong E 2020).

Dong E, Gardner L., Du H. 2020. “COVID-19 Dashboard by the Center for Systems Science and Engineering (Csse) at Johns Hopkins University (Jhu).” https://doi.org/10.1016/S1473-3099(20)30120-1.

R Core Team. 2015. “R: A Language and Environment for Statistical Computing.” Journal Article. http://www.R-project.org.